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  #81  
Old 07-12-2008, 12:40 PM
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AlexN
Widefield wuss

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Peter: Have you tried giving it a clean? with something like spray & wipe or the like? Might just be some greasy/dirty substance?
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  #82  
Old 07-12-2008, 02:53 PM
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peter_4059 (Peter)
Big Scopes are Cool

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It's inside the laminate - like a dark patch - possibly some dust.
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  #83  
Old 08-12-2008, 11:14 AM
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multiweb (Marc)
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If it comes to worst you could rotate your light box when taking flats. The dark patch will go when combining the master flat.
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